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![stephen hemminger](/assets/img/avatar_default.png)
Since there already is a special case goto for control messages (skb == NULL) in netvsc_send, there is no need for later checks in same code path. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1346 lines
37 KiB
C
1346 lines
37 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/if_ether.h>
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#include <linux/vmalloc.h>
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#include <asm/sync_bitops.h>
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#include "hyperv_net.h"
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/*
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* Switch the data path from the synthetic interface to the VF
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* interface.
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*/
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void netvsc_switch_datapath(struct net_device *ndev, bool vf)
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{
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struct net_device_context *net_device_ctx = netdev_priv(ndev);
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struct hv_device *dev = net_device_ctx->device_ctx;
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struct netvsc_device *nv_dev = net_device_ctx->nvdev;
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struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
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memset(init_pkt, 0, sizeof(struct nvsp_message));
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init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
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if (vf)
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init_pkt->msg.v4_msg.active_dp.active_datapath =
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NVSP_DATAPATH_VF;
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else
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init_pkt->msg.v4_msg.active_dp.active_datapath =
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NVSP_DATAPATH_SYNTHETIC;
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vmbus_sendpacket(dev->channel, init_pkt,
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sizeof(struct nvsp_message),
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(unsigned long)init_pkt,
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VM_PKT_DATA_INBAND, 0);
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}
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static struct netvsc_device *alloc_net_device(void)
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{
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struct netvsc_device *net_device;
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net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
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if (!net_device)
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return NULL;
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net_device->chan_table[0].mrc.buf
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= vzalloc(NETVSC_RECVSLOT_MAX * sizeof(struct recv_comp_data));
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init_waitqueue_head(&net_device->wait_drain);
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net_device->destroy = false;
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atomic_set(&net_device->open_cnt, 0);
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net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
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net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
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init_completion(&net_device->channel_init_wait);
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return net_device;
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}
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static void free_netvsc_device(struct rcu_head *head)
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{
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struct netvsc_device *nvdev
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= container_of(head, struct netvsc_device, rcu);
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int i;
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for (i = 0; i < VRSS_CHANNEL_MAX; i++)
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vfree(nvdev->chan_table[i].mrc.buf);
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kfree(nvdev);
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}
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static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
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{
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call_rcu(&nvdev->rcu, free_netvsc_device);
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}
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static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
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if (net_device && net_device->destroy)
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net_device = NULL;
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return net_device;
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}
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static void netvsc_destroy_buf(struct hv_device *device)
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{
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struct nvsp_message *revoke_packet;
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struct net_device *ndev = hv_get_drvdata(device);
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struct netvsc_device *net_device = net_device_to_netvsc_device(ndev);
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int ret;
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/*
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* If we got a section count, it means we received a
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* SendReceiveBufferComplete msg (ie sent
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* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
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* to send a revoke msg here
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*/
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if (net_device->recv_section_cnt) {
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/* Send the revoke receive buffer */
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revoke_packet = &net_device->revoke_packet;
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memset(revoke_packet, 0, sizeof(struct nvsp_message));
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revoke_packet->hdr.msg_type =
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NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
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revoke_packet->msg.v1_msg.
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revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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ret = vmbus_sendpacket(device->channel,
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revoke_packet,
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sizeof(struct nvsp_message),
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(unsigned long)revoke_packet,
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VM_PKT_DATA_INBAND, 0);
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/*
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* If we failed here, we might as well return and
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* have a leak rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev, "unable to send "
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"revoke receive buffer to netvsp\n");
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return;
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}
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}
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/* Teardown the gpadl on the vsp end */
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if (net_device->recv_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(device->channel,
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net_device->recv_buf_gpadl_handle);
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/* If we failed here, we might as well return and have a leak
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* rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev,
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"unable to teardown receive buffer's gpadl\n");
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return;
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}
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net_device->recv_buf_gpadl_handle = 0;
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}
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if (net_device->recv_buf) {
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/* Free up the receive buffer */
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vfree(net_device->recv_buf);
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net_device->recv_buf = NULL;
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}
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if (net_device->recv_section) {
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net_device->recv_section_cnt = 0;
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kfree(net_device->recv_section);
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net_device->recv_section = NULL;
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}
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/* Deal with the send buffer we may have setup.
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* If we got a send section size, it means we received a
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* NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
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* NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
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* to send a revoke msg here
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*/
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if (net_device->send_section_size) {
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/* Send the revoke receive buffer */
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revoke_packet = &net_device->revoke_packet;
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memset(revoke_packet, 0, sizeof(struct nvsp_message));
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revoke_packet->hdr.msg_type =
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NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
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revoke_packet->msg.v1_msg.revoke_send_buf.id =
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NETVSC_SEND_BUFFER_ID;
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ret = vmbus_sendpacket(device->channel,
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revoke_packet,
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sizeof(struct nvsp_message),
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(unsigned long)revoke_packet,
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VM_PKT_DATA_INBAND, 0);
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/* If we failed here, we might as well return and
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* have a leak rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev, "unable to send "
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"revoke send buffer to netvsp\n");
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return;
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}
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}
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/* Teardown the gpadl on the vsp end */
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if (net_device->send_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(device->channel,
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net_device->send_buf_gpadl_handle);
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/* If we failed here, we might as well return and have a leak
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* rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev,
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"unable to teardown send buffer's gpadl\n");
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return;
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}
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net_device->send_buf_gpadl_handle = 0;
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}
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if (net_device->send_buf) {
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/* Free up the send buffer */
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vfree(net_device->send_buf);
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net_device->send_buf = NULL;
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}
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kfree(net_device->send_section_map);
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}
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static int netvsc_init_buf(struct hv_device *device)
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{
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int ret = 0;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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struct net_device *ndev;
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int node;
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net_device = get_outbound_net_device(device);
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if (!net_device)
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return -ENODEV;
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ndev = hv_get_drvdata(device);
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node = cpu_to_node(device->channel->target_cpu);
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net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
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if (!net_device->recv_buf)
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net_device->recv_buf = vzalloc(net_device->recv_buf_size);
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if (!net_device->recv_buf) {
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netdev_err(ndev, "unable to allocate receive "
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"buffer of size %d\n", net_device->recv_buf_size);
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ret = -ENOMEM;
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goto cleanup;
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}
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/*
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* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
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net_device->recv_buf_size,
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&net_device->recv_buf_gpadl_handle);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to establish receive buffer's gpadl\n");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
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init_packet->msg.v1_msg.send_recv_buf.
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gpadl_handle = net_device->recv_buf_gpadl_handle;
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init_packet->msg.v1_msg.
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send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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/* Send the gpadl notification request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to send receive buffer's gpadl to netvsp\n");
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goto cleanup;
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}
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wait_for_completion(&net_device->channel_init_wait);
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
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netdev_err(ndev, "Unable to complete receive buffer "
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"initialization with NetVsp - status %d\n",
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init_packet->msg.v1_msg.
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send_recv_buf_complete.status);
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ret = -EINVAL;
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goto cleanup;
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}
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/* Parse the response */
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net_device->recv_section_cnt = init_packet->msg.
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v1_msg.send_recv_buf_complete.num_sections;
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net_device->recv_section = kmemdup(
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init_packet->msg.v1_msg.send_recv_buf_complete.sections,
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net_device->recv_section_cnt *
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sizeof(struct nvsp_1_receive_buffer_section),
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GFP_KERNEL);
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if (net_device->recv_section == NULL) {
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ret = -EINVAL;
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goto cleanup;
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}
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/*
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* For 1st release, there should only be 1 section that represents the
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* entire receive buffer
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*/
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if (net_device->recv_section_cnt != 1 ||
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net_device->recv_section->offset != 0) {
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ret = -EINVAL;
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goto cleanup;
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}
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/* Now setup the send buffer.
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*/
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net_device->send_buf = vzalloc_node(net_device->send_buf_size, node);
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if (!net_device->send_buf)
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net_device->send_buf = vzalloc(net_device->send_buf_size);
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if (!net_device->send_buf) {
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netdev_err(ndev, "unable to allocate send "
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"buffer of size %d\n", net_device->send_buf_size);
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ret = -ENOMEM;
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goto cleanup;
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}
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/* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
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net_device->send_buf_size,
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&net_device->send_buf_gpadl_handle);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to establish send buffer's gpadl\n");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
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init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
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net_device->send_buf_gpadl_handle;
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init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
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|
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/* Send the gpadl notification request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to send send buffer's gpadl to netvsp\n");
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goto cleanup;
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}
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|
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wait_for_completion(&net_device->channel_init_wait);
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|
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
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netdev_err(ndev, "Unable to complete send buffer "
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"initialization with NetVsp - status %d\n",
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init_packet->msg.v1_msg.
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send_send_buf_complete.status);
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ret = -EINVAL;
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goto cleanup;
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}
|
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|
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/* Parse the response */
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net_device->send_section_size = init_packet->msg.
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v1_msg.send_send_buf_complete.section_size;
|
|
|
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/* Section count is simply the size divided by the section size.
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*/
|
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net_device->send_section_cnt =
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net_device->send_buf_size / net_device->send_section_size;
|
|
|
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netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
|
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net_device->send_section_size, net_device->send_section_cnt);
|
|
|
|
/* Setup state for managing the send buffer. */
|
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net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
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BITS_PER_LONG);
|
|
|
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net_device->send_section_map = kcalloc(net_device->map_words,
|
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sizeof(ulong), GFP_KERNEL);
|
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if (net_device->send_section_map == NULL) {
|
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ret = -ENOMEM;
|
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goto cleanup;
|
|
}
|
|
|
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goto exit;
|
|
|
|
cleanup:
|
|
netvsc_destroy_buf(device);
|
|
|
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exit:
|
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return ret;
|
|
}
|
|
|
|
/* Negotiate NVSP protocol version */
|
|
static int negotiate_nvsp_ver(struct hv_device *device,
|
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struct netvsc_device *net_device,
|
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struct nvsp_message *init_packet,
|
|
u32 nvsp_ver)
|
|
{
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
int ret;
|
|
|
|
memset(init_packet, 0, sizeof(struct nvsp_message));
|
|
init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
|
|
init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
|
|
init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
|
|
|
|
/* Send the init request */
|
|
ret = vmbus_sendpacket(device->channel, init_packet,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)init_packet,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
wait_for_completion(&net_device->channel_init_wait);
|
|
|
|
if (init_packet->msg.init_msg.init_complete.status !=
|
|
NVSP_STAT_SUCCESS)
|
|
return -EINVAL;
|
|
|
|
if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
|
|
return 0;
|
|
|
|
/* NVSPv2 or later: Send NDIS config */
|
|
memset(init_packet, 0, sizeof(struct nvsp_message));
|
|
init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
|
|
init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
|
|
init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
|
|
|
|
if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
|
|
init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
|
|
|
|
/* Teaming bit is needed to receive link speed updates */
|
|
init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
|
|
}
|
|
|
|
ret = vmbus_sendpacket(device->channel, init_packet,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)init_packet,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int netvsc_connect_vsp(struct hv_device *device)
|
|
{
|
|
int ret;
|
|
struct netvsc_device *net_device;
|
|
struct nvsp_message *init_packet;
|
|
int ndis_version;
|
|
const u32 ver_list[] = {
|
|
NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
|
|
NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
|
|
int i;
|
|
|
|
net_device = get_outbound_net_device(device);
|
|
if (!net_device)
|
|
return -ENODEV;
|
|
|
|
init_packet = &net_device->channel_init_pkt;
|
|
|
|
/* Negotiate the latest NVSP protocol supported */
|
|
for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
|
|
if (negotiate_nvsp_ver(device, net_device, init_packet,
|
|
ver_list[i]) == 0) {
|
|
net_device->nvsp_version = ver_list[i];
|
|
break;
|
|
}
|
|
|
|
if (i < 0) {
|
|
ret = -EPROTO;
|
|
goto cleanup;
|
|
}
|
|
|
|
pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
|
|
|
|
/* Send the ndis version */
|
|
memset(init_packet, 0, sizeof(struct nvsp_message));
|
|
|
|
if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
|
|
ndis_version = 0x00060001;
|
|
else
|
|
ndis_version = 0x0006001e;
|
|
|
|
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
|
|
init_packet->msg.v1_msg.
|
|
send_ndis_ver.ndis_major_ver =
|
|
(ndis_version & 0xFFFF0000) >> 16;
|
|
init_packet->msg.v1_msg.
|
|
send_ndis_ver.ndis_minor_ver =
|
|
ndis_version & 0xFFFF;
|
|
|
|
/* Send the init request */
|
|
ret = vmbus_sendpacket(device->channel, init_packet,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)init_packet,
|
|
VM_PKT_DATA_INBAND, 0);
|
|
if (ret != 0)
|
|
goto cleanup;
|
|
|
|
/* Post the big receive buffer to NetVSP */
|
|
if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
|
|
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
|
|
else
|
|
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
|
|
net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
|
|
|
|
ret = netvsc_init_buf(device);
|
|
|
|
cleanup:
|
|
return ret;
|
|
}
|
|
|
|
static void netvsc_disconnect_vsp(struct hv_device *device)
|
|
{
|
|
netvsc_destroy_buf(device);
|
|
}
|
|
|
|
/*
|
|
* netvsc_device_remove - Callback when the root bus device is removed
|
|
*/
|
|
void netvsc_device_remove(struct hv_device *device)
|
|
{
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
struct net_device_context *net_device_ctx = netdev_priv(ndev);
|
|
struct netvsc_device *net_device = net_device_ctx->nvdev;
|
|
int i;
|
|
|
|
netvsc_disconnect_vsp(device);
|
|
|
|
RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
|
|
|
|
/*
|
|
* At this point, no one should be accessing net_device
|
|
* except in here
|
|
*/
|
|
netdev_dbg(ndev, "net device safe to remove\n");
|
|
|
|
/* Now, we can close the channel safely */
|
|
vmbus_close(device->channel);
|
|
|
|
for (i = 0; i < net_device->num_chn; i++)
|
|
napi_disable(&net_device->chan_table[i].napi);
|
|
|
|
/* Release all resources */
|
|
free_netvsc_device_rcu(net_device);
|
|
}
|
|
|
|
#define RING_AVAIL_PERCENT_HIWATER 20
|
|
#define RING_AVAIL_PERCENT_LOWATER 10
|
|
|
|
/*
|
|
* Get the percentage of available bytes to write in the ring.
|
|
* The return value is in range from 0 to 100.
|
|
*/
|
|
static inline u32 hv_ringbuf_avail_percent(
|
|
struct hv_ring_buffer_info *ring_info)
|
|
{
|
|
u32 avail_read, avail_write;
|
|
|
|
hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
|
|
|
|
return avail_write * 100 / ring_info->ring_datasize;
|
|
}
|
|
|
|
static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
|
|
u32 index)
|
|
{
|
|
sync_change_bit(index, net_device->send_section_map);
|
|
}
|
|
|
|
static void netvsc_send_tx_complete(struct netvsc_device *net_device,
|
|
struct vmbus_channel *incoming_channel,
|
|
struct hv_device *device,
|
|
const struct vmpacket_descriptor *desc)
|
|
{
|
|
struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
struct vmbus_channel *channel = device->channel;
|
|
u16 q_idx = 0;
|
|
int queue_sends;
|
|
|
|
/* Notify the layer above us */
|
|
if (likely(skb)) {
|
|
const struct hv_netvsc_packet *packet
|
|
= (struct hv_netvsc_packet *)skb->cb;
|
|
u32 send_index = packet->send_buf_index;
|
|
struct netvsc_stats *tx_stats;
|
|
|
|
if (send_index != NETVSC_INVALID_INDEX)
|
|
netvsc_free_send_slot(net_device, send_index);
|
|
q_idx = packet->q_idx;
|
|
channel = incoming_channel;
|
|
|
|
tx_stats = &net_device->chan_table[q_idx].tx_stats;
|
|
|
|
u64_stats_update_begin(&tx_stats->syncp);
|
|
tx_stats->packets += packet->total_packets;
|
|
tx_stats->bytes += packet->total_bytes;
|
|
u64_stats_update_end(&tx_stats->syncp);
|
|
|
|
dev_consume_skb_any(skb);
|
|
}
|
|
|
|
queue_sends =
|
|
atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
|
|
|
|
if (net_device->destroy && queue_sends == 0)
|
|
wake_up(&net_device->wait_drain);
|
|
|
|
if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
|
|
(hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER ||
|
|
queue_sends < 1))
|
|
netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx));
|
|
}
|
|
|
|
static void netvsc_send_completion(struct netvsc_device *net_device,
|
|
struct vmbus_channel *incoming_channel,
|
|
struct hv_device *device,
|
|
const struct vmpacket_descriptor *desc)
|
|
{
|
|
struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
|
|
switch (nvsp_packet->hdr.msg_type) {
|
|
case NVSP_MSG_TYPE_INIT_COMPLETE:
|
|
case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
|
|
case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
|
|
case NVSP_MSG5_TYPE_SUBCHANNEL:
|
|
/* Copy the response back */
|
|
memcpy(&net_device->channel_init_pkt, nvsp_packet,
|
|
sizeof(struct nvsp_message));
|
|
complete(&net_device->channel_init_wait);
|
|
break;
|
|
|
|
case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
|
|
netvsc_send_tx_complete(net_device, incoming_channel,
|
|
device, desc);
|
|
break;
|
|
|
|
default:
|
|
netdev_err(ndev,
|
|
"Unknown send completion type %d received!!\n",
|
|
nvsp_packet->hdr.msg_type);
|
|
}
|
|
}
|
|
|
|
static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
|
|
{
|
|
unsigned long *map_addr = net_device->send_section_map;
|
|
unsigned int i;
|
|
|
|
for_each_clear_bit(i, map_addr, net_device->map_words) {
|
|
if (sync_test_and_set_bit(i, map_addr) == 0)
|
|
return i;
|
|
}
|
|
|
|
return NETVSC_INVALID_INDEX;
|
|
}
|
|
|
|
static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
|
|
unsigned int section_index,
|
|
u32 pend_size,
|
|
struct hv_netvsc_packet *packet,
|
|
struct rndis_message *rndis_msg,
|
|
struct hv_page_buffer **pb,
|
|
struct sk_buff *skb)
|
|
{
|
|
char *start = net_device->send_buf;
|
|
char *dest = start + (section_index * net_device->send_section_size)
|
|
+ pend_size;
|
|
int i;
|
|
u32 msg_size = 0;
|
|
u32 padding = 0;
|
|
u32 remain = packet->total_data_buflen % net_device->pkt_align;
|
|
u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
|
|
packet->page_buf_cnt;
|
|
|
|
/* Add padding */
|
|
if (skb->xmit_more && remain && !packet->cp_partial) {
|
|
padding = net_device->pkt_align - remain;
|
|
rndis_msg->msg_len += padding;
|
|
packet->total_data_buflen += padding;
|
|
}
|
|
|
|
for (i = 0; i < page_count; i++) {
|
|
char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT);
|
|
u32 offset = (*pb)[i].offset;
|
|
u32 len = (*pb)[i].len;
|
|
|
|
memcpy(dest, (src + offset), len);
|
|
msg_size += len;
|
|
dest += len;
|
|
}
|
|
|
|
if (padding) {
|
|
memset(dest, 0, padding);
|
|
msg_size += padding;
|
|
}
|
|
|
|
return msg_size;
|
|
}
|
|
|
|
static inline int netvsc_send_pkt(
|
|
struct hv_device *device,
|
|
struct hv_netvsc_packet *packet,
|
|
struct netvsc_device *net_device,
|
|
struct hv_page_buffer **pb,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nvsp_message nvmsg;
|
|
struct netvsc_channel *nvchan
|
|
= &net_device->chan_table[packet->q_idx];
|
|
struct vmbus_channel *out_channel = nvchan->channel;
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
|
|
u64 req_id;
|
|
int ret;
|
|
struct hv_page_buffer *pgbuf;
|
|
u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
|
|
|
|
nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
|
|
if (skb != NULL) {
|
|
/* 0 is RMC_DATA; */
|
|
nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0;
|
|
} else {
|
|
/* 1 is RMC_CONTROL; */
|
|
nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1;
|
|
}
|
|
|
|
nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
|
|
packet->send_buf_index;
|
|
if (packet->send_buf_index == NETVSC_INVALID_INDEX)
|
|
nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
|
|
else
|
|
nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size =
|
|
packet->total_data_buflen;
|
|
|
|
req_id = (ulong)skb;
|
|
|
|
if (out_channel->rescind)
|
|
return -ENODEV;
|
|
|
|
if (packet->page_buf_cnt) {
|
|
pgbuf = packet->cp_partial ? (*pb) +
|
|
packet->rmsg_pgcnt : (*pb);
|
|
ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
|
|
pgbuf,
|
|
packet->page_buf_cnt,
|
|
&nvmsg,
|
|
sizeof(struct nvsp_message),
|
|
req_id,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
} else {
|
|
ret = vmbus_sendpacket_ctl(out_channel, &nvmsg,
|
|
sizeof(struct nvsp_message),
|
|
req_id,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
}
|
|
|
|
if (ret == 0) {
|
|
atomic_inc_return(&nvchan->queue_sends);
|
|
|
|
if (ring_avail < RING_AVAIL_PERCENT_LOWATER)
|
|
netif_tx_stop_queue(txq);
|
|
} else if (ret == -EAGAIN) {
|
|
netif_tx_stop_queue(txq);
|
|
if (atomic_read(&nvchan->queue_sends) < 1) {
|
|
netif_tx_wake_queue(txq);
|
|
ret = -ENOSPC;
|
|
}
|
|
} else {
|
|
netdev_err(ndev, "Unable to send packet %p ret %d\n",
|
|
packet, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Move packet out of multi send data (msd), and clear msd */
|
|
static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
|
|
struct sk_buff **msd_skb,
|
|
struct multi_send_data *msdp)
|
|
{
|
|
*msd_skb = msdp->skb;
|
|
*msd_send = msdp->pkt;
|
|
msdp->skb = NULL;
|
|
msdp->pkt = NULL;
|
|
msdp->count = 0;
|
|
}
|
|
|
|
int netvsc_send(struct hv_device *device,
|
|
struct hv_netvsc_packet *packet,
|
|
struct rndis_message *rndis_msg,
|
|
struct hv_page_buffer **pb,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct netvsc_device *net_device;
|
|
int ret = 0;
|
|
struct netvsc_channel *nvchan;
|
|
u32 pktlen = packet->total_data_buflen, msd_len = 0;
|
|
unsigned int section_index = NETVSC_INVALID_INDEX;
|
|
struct multi_send_data *msdp;
|
|
struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
|
|
struct sk_buff *msd_skb = NULL;
|
|
bool try_batch;
|
|
bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
|
|
|
|
net_device = get_outbound_net_device(device);
|
|
if (!net_device)
|
|
return -ENODEV;
|
|
|
|
/* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get
|
|
* here before the negotiation with the host is finished and
|
|
* send_section_map may not be allocated yet.
|
|
*/
|
|
if (!net_device->send_section_map)
|
|
return -EAGAIN;
|
|
|
|
nvchan = &net_device->chan_table[packet->q_idx];
|
|
packet->send_buf_index = NETVSC_INVALID_INDEX;
|
|
packet->cp_partial = false;
|
|
|
|
/* Send control message directly without accessing msd (Multi-Send
|
|
* Data) field which may be changed during data packet processing.
|
|
*/
|
|
if (!skb) {
|
|
cur_send = packet;
|
|
goto send_now;
|
|
}
|
|
|
|
/* batch packets in send buffer if possible */
|
|
msdp = &nvchan->msd;
|
|
if (msdp->pkt)
|
|
msd_len = msdp->pkt->total_data_buflen;
|
|
|
|
try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
|
|
if (try_batch && msd_len + pktlen + net_device->pkt_align <
|
|
net_device->send_section_size) {
|
|
section_index = msdp->pkt->send_buf_index;
|
|
|
|
} else if (try_batch && msd_len + packet->rmsg_size <
|
|
net_device->send_section_size) {
|
|
section_index = msdp->pkt->send_buf_index;
|
|
packet->cp_partial = true;
|
|
|
|
} else if (pktlen + net_device->pkt_align <
|
|
net_device->send_section_size) {
|
|
section_index = netvsc_get_next_send_section(net_device);
|
|
if (section_index != NETVSC_INVALID_INDEX) {
|
|
move_pkt_msd(&msd_send, &msd_skb, msdp);
|
|
msd_len = 0;
|
|
}
|
|
}
|
|
|
|
if (section_index != NETVSC_INVALID_INDEX) {
|
|
netvsc_copy_to_send_buf(net_device,
|
|
section_index, msd_len,
|
|
packet, rndis_msg, pb, skb);
|
|
|
|
packet->send_buf_index = section_index;
|
|
|
|
if (packet->cp_partial) {
|
|
packet->page_buf_cnt -= packet->rmsg_pgcnt;
|
|
packet->total_data_buflen = msd_len + packet->rmsg_size;
|
|
} else {
|
|
packet->page_buf_cnt = 0;
|
|
packet->total_data_buflen += msd_len;
|
|
}
|
|
|
|
if (msdp->pkt) {
|
|
packet->total_packets += msdp->pkt->total_packets;
|
|
packet->total_bytes += msdp->pkt->total_bytes;
|
|
}
|
|
|
|
if (msdp->skb)
|
|
dev_consume_skb_any(msdp->skb);
|
|
|
|
if (xmit_more && !packet->cp_partial) {
|
|
msdp->skb = skb;
|
|
msdp->pkt = packet;
|
|
msdp->count++;
|
|
} else {
|
|
cur_send = packet;
|
|
msdp->skb = NULL;
|
|
msdp->pkt = NULL;
|
|
msdp->count = 0;
|
|
}
|
|
} else {
|
|
move_pkt_msd(&msd_send, &msd_skb, msdp);
|
|
cur_send = packet;
|
|
}
|
|
|
|
if (msd_send) {
|
|
int m_ret = netvsc_send_pkt(device, msd_send, net_device,
|
|
NULL, msd_skb);
|
|
|
|
if (m_ret != 0) {
|
|
netvsc_free_send_slot(net_device,
|
|
msd_send->send_buf_index);
|
|
dev_kfree_skb_any(msd_skb);
|
|
}
|
|
}
|
|
|
|
send_now:
|
|
if (cur_send)
|
|
ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
|
|
|
|
if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
|
|
netvsc_free_send_slot(net_device, section_index);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int netvsc_send_recv_completion(struct vmbus_channel *channel,
|
|
u64 transaction_id, u32 status)
|
|
{
|
|
struct nvsp_message recvcompMessage;
|
|
int ret;
|
|
|
|
recvcompMessage.hdr.msg_type =
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
|
|
|
|
recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
|
|
|
|
/* Send the completion */
|
|
ret = vmbus_sendpacket(channel, &recvcompMessage,
|
|
sizeof(struct nvsp_message_header) + sizeof(u32),
|
|
transaction_id, VM_PKT_COMP, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void count_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx,
|
|
u32 *filled, u32 *avail)
|
|
{
|
|
struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc;
|
|
u32 first = mrc->first;
|
|
u32 next = mrc->next;
|
|
|
|
*filled = (first > next) ? NETVSC_RECVSLOT_MAX - first + next :
|
|
next - first;
|
|
|
|
*avail = NETVSC_RECVSLOT_MAX - *filled - 1;
|
|
}
|
|
|
|
/* Read the first filled slot, no change to index */
|
|
static inline struct recv_comp_data *read_recv_comp_slot(struct netvsc_device
|
|
*nvdev, u16 q_idx)
|
|
{
|
|
struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc;
|
|
u32 filled, avail;
|
|
|
|
if (unlikely(!mrc->buf))
|
|
return NULL;
|
|
|
|
count_recv_comp_slot(nvdev, q_idx, &filled, &avail);
|
|
if (!filled)
|
|
return NULL;
|
|
|
|
return mrc->buf + mrc->first * sizeof(struct recv_comp_data);
|
|
}
|
|
|
|
/* Put the first filled slot back to available pool */
|
|
static inline void put_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx)
|
|
{
|
|
struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc;
|
|
int num_recv;
|
|
|
|
mrc->first = (mrc->first + 1) % NETVSC_RECVSLOT_MAX;
|
|
|
|
num_recv = atomic_dec_return(&nvdev->num_outstanding_recvs);
|
|
|
|
if (nvdev->destroy && num_recv == 0)
|
|
wake_up(&nvdev->wait_drain);
|
|
}
|
|
|
|
/* Check and send pending recv completions */
|
|
static void netvsc_chk_recv_comp(struct netvsc_device *nvdev,
|
|
struct vmbus_channel *channel, u16 q_idx)
|
|
{
|
|
struct recv_comp_data *rcd;
|
|
int ret;
|
|
|
|
while (true) {
|
|
rcd = read_recv_comp_slot(nvdev, q_idx);
|
|
if (!rcd)
|
|
break;
|
|
|
|
ret = netvsc_send_recv_completion(channel, rcd->tid,
|
|
rcd->status);
|
|
if (ret)
|
|
break;
|
|
|
|
put_recv_comp_slot(nvdev, q_idx);
|
|
}
|
|
}
|
|
|
|
#define NETVSC_RCD_WATERMARK 80
|
|
|
|
/* Get next available slot */
|
|
static inline struct recv_comp_data *get_recv_comp_slot(
|
|
struct netvsc_device *nvdev, struct vmbus_channel *channel, u16 q_idx)
|
|
{
|
|
struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc;
|
|
u32 filled, avail, next;
|
|
struct recv_comp_data *rcd;
|
|
|
|
if (unlikely(!nvdev->recv_section))
|
|
return NULL;
|
|
|
|
if (unlikely(!mrc->buf))
|
|
return NULL;
|
|
|
|
if (atomic_read(&nvdev->num_outstanding_recvs) >
|
|
nvdev->recv_section->num_sub_allocs * NETVSC_RCD_WATERMARK / 100)
|
|
netvsc_chk_recv_comp(nvdev, channel, q_idx);
|
|
|
|
count_recv_comp_slot(nvdev, q_idx, &filled, &avail);
|
|
if (!avail)
|
|
return NULL;
|
|
|
|
next = mrc->next;
|
|
rcd = mrc->buf + next * sizeof(struct recv_comp_data);
|
|
mrc->next = (next + 1) % NETVSC_RECVSLOT_MAX;
|
|
|
|
atomic_inc(&nvdev->num_outstanding_recvs);
|
|
|
|
return rcd;
|
|
}
|
|
|
|
static int netvsc_receive(struct net_device *ndev,
|
|
struct netvsc_device *net_device,
|
|
struct net_device_context *net_device_ctx,
|
|
struct hv_device *device,
|
|
struct vmbus_channel *channel,
|
|
const struct vmpacket_descriptor *desc,
|
|
struct nvsp_message *nvsp)
|
|
{
|
|
const struct vmtransfer_page_packet_header *vmxferpage_packet
|
|
= container_of(desc, const struct vmtransfer_page_packet_header, d);
|
|
u16 q_idx = channel->offermsg.offer.sub_channel_index;
|
|
char *recv_buf = net_device->recv_buf;
|
|
u32 status = NVSP_STAT_SUCCESS;
|
|
int i;
|
|
int count = 0;
|
|
int ret;
|
|
|
|
/* Make sure this is a valid nvsp packet */
|
|
if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
|
|
netif_err(net_device_ctx, rx_err, ndev,
|
|
"Unknown nvsp packet type received %u\n",
|
|
nvsp->hdr.msg_type);
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
|
|
netif_err(net_device_ctx, rx_err, ndev,
|
|
"Invalid xfer page set id - expecting %x got %x\n",
|
|
NETVSC_RECEIVE_BUFFER_ID,
|
|
vmxferpage_packet->xfer_pageset_id);
|
|
return 0;
|
|
}
|
|
|
|
count = vmxferpage_packet->range_cnt;
|
|
|
|
/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
|
|
for (i = 0; i < count; i++) {
|
|
void *data = recv_buf
|
|
+ vmxferpage_packet->ranges[i].byte_offset;
|
|
u32 buflen = vmxferpage_packet->ranges[i].byte_count;
|
|
|
|
/* Pass it to the upper layer */
|
|
status = rndis_filter_receive(ndev, net_device, device,
|
|
channel, data, buflen);
|
|
}
|
|
|
|
if (net_device->chan_table[q_idx].mrc.buf) {
|
|
struct recv_comp_data *rcd;
|
|
|
|
rcd = get_recv_comp_slot(net_device, channel, q_idx);
|
|
if (rcd) {
|
|
rcd->tid = vmxferpage_packet->d.trans_id;
|
|
rcd->status = status;
|
|
} else {
|
|
netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
|
|
q_idx, vmxferpage_packet->d.trans_id);
|
|
}
|
|
} else {
|
|
ret = netvsc_send_recv_completion(channel,
|
|
vmxferpage_packet->d.trans_id,
|
|
status);
|
|
if (ret)
|
|
netdev_err(ndev, "Recv_comp q:%hd, tid:%llx, err:%d\n",
|
|
q_idx, vmxferpage_packet->d.trans_id, ret);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static void netvsc_send_table(struct hv_device *hdev,
|
|
struct nvsp_message *nvmsg)
|
|
{
|
|
struct net_device *ndev = hv_get_drvdata(hdev);
|
|
struct net_device_context *net_device_ctx = netdev_priv(ndev);
|
|
int i;
|
|
u32 count, *tab;
|
|
|
|
count = nvmsg->msg.v5_msg.send_table.count;
|
|
if (count != VRSS_SEND_TAB_SIZE) {
|
|
netdev_err(ndev, "Received wrong send-table size:%u\n", count);
|
|
return;
|
|
}
|
|
|
|
tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
|
|
nvmsg->msg.v5_msg.send_table.offset);
|
|
|
|
for (i = 0; i < count; i++)
|
|
net_device_ctx->tx_send_table[i] = tab[i];
|
|
}
|
|
|
|
static void netvsc_send_vf(struct net_device_context *net_device_ctx,
|
|
struct nvsp_message *nvmsg)
|
|
{
|
|
net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
|
|
net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
|
|
}
|
|
|
|
static inline void netvsc_receive_inband(struct hv_device *hdev,
|
|
struct net_device_context *net_device_ctx,
|
|
struct nvsp_message *nvmsg)
|
|
{
|
|
switch (nvmsg->hdr.msg_type) {
|
|
case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
|
|
netvsc_send_table(hdev, nvmsg);
|
|
break;
|
|
|
|
case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
|
|
netvsc_send_vf(net_device_ctx, nvmsg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int netvsc_process_raw_pkt(struct hv_device *device,
|
|
struct vmbus_channel *channel,
|
|
struct netvsc_device *net_device,
|
|
struct net_device *ndev,
|
|
const struct vmpacket_descriptor *desc)
|
|
{
|
|
struct net_device_context *net_device_ctx = netdev_priv(ndev);
|
|
struct nvsp_message *nvmsg = hv_pkt_data(desc);
|
|
|
|
switch (desc->type) {
|
|
case VM_PKT_COMP:
|
|
netvsc_send_completion(net_device, channel, device, desc);
|
|
break;
|
|
|
|
case VM_PKT_DATA_USING_XFER_PAGES:
|
|
return netvsc_receive(ndev, net_device, net_device_ctx,
|
|
device, channel, desc, nvmsg);
|
|
break;
|
|
|
|
case VM_PKT_DATA_INBAND:
|
|
netvsc_receive_inband(device, net_device_ctx, nvmsg);
|
|
break;
|
|
|
|
default:
|
|
netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
|
|
desc->type, desc->trans_id);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
|
|
{
|
|
struct vmbus_channel *primary = channel->primary_channel;
|
|
|
|
return primary ? primary->device_obj : channel->device_obj;
|
|
}
|
|
|
|
/* Network processing softirq
|
|
* Process data in incoming ring buffer from host
|
|
* Stops when ring is empty or budget is met or exceeded.
|
|
*/
|
|
int netvsc_poll(struct napi_struct *napi, int budget)
|
|
{
|
|
struct netvsc_channel *nvchan
|
|
= container_of(napi, struct netvsc_channel, napi);
|
|
struct vmbus_channel *channel = nvchan->channel;
|
|
struct hv_device *device = netvsc_channel_to_device(channel);
|
|
u16 q_idx = channel->offermsg.offer.sub_channel_index;
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
struct netvsc_device *net_device = net_device_to_netvsc_device(ndev);
|
|
int work_done = 0;
|
|
|
|
/* If starting a new interval */
|
|
if (!nvchan->desc)
|
|
nvchan->desc = hv_pkt_iter_first(channel);
|
|
|
|
while (nvchan->desc && work_done < budget) {
|
|
work_done += netvsc_process_raw_pkt(device, channel, net_device,
|
|
ndev, nvchan->desc);
|
|
nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
|
|
}
|
|
|
|
/* If receive ring was exhausted
|
|
* and not doing busy poll
|
|
* then re-enable host interrupts
|
|
* and reschedule if ring is not empty.
|
|
*/
|
|
if (work_done < budget &&
|
|
napi_complete_done(napi, work_done) &&
|
|
hv_end_read(&channel->inbound) != 0)
|
|
napi_reschedule(napi);
|
|
|
|
netvsc_chk_recv_comp(net_device, channel, q_idx);
|
|
|
|
/* Driver may overshoot since multiple packets per descriptor */
|
|
return min(work_done, budget);
|
|
}
|
|
|
|
/* Call back when data is available in host ring buffer.
|
|
* Processing is deferred until network softirq (NAPI)
|
|
*/
|
|
void netvsc_channel_cb(void *context)
|
|
{
|
|
struct netvsc_channel *nvchan = context;
|
|
|
|
if (napi_schedule_prep(&nvchan->napi)) {
|
|
/* disable interupts from host */
|
|
hv_begin_read(&nvchan->channel->inbound);
|
|
|
|
__napi_schedule(&nvchan->napi);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* netvsc_device_add - Callback when the device belonging to this
|
|
* driver is added
|
|
*/
|
|
int netvsc_device_add(struct hv_device *device,
|
|
const struct netvsc_device_info *device_info)
|
|
{
|
|
int i, ret = 0;
|
|
int ring_size = device_info->ring_size;
|
|
struct netvsc_device *net_device;
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
struct net_device_context *net_device_ctx = netdev_priv(ndev);
|
|
|
|
net_device = alloc_net_device();
|
|
if (!net_device)
|
|
return -ENOMEM;
|
|
|
|
net_device->ring_size = ring_size;
|
|
|
|
/* Because the device uses NAPI, all the interrupt batching and
|
|
* control is done via Net softirq, not the channel handling
|
|
*/
|
|
set_channel_read_mode(device->channel, HV_CALL_ISR);
|
|
|
|
/* Open the channel */
|
|
ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
|
|
ring_size * PAGE_SIZE, NULL, 0,
|
|
netvsc_channel_cb,
|
|
net_device->chan_table);
|
|
|
|
if (ret != 0) {
|
|
netdev_err(ndev, "unable to open channel: %d\n", ret);
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Channel is opened */
|
|
netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
|
|
|
|
/* If we're reopening the device we may have multiple queues, fill the
|
|
* chn_table with the default channel to use it before subchannels are
|
|
* opened.
|
|
*/
|
|
for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
|
|
struct netvsc_channel *nvchan = &net_device->chan_table[i];
|
|
|
|
nvchan->channel = device->channel;
|
|
netif_napi_add(ndev, &nvchan->napi,
|
|
netvsc_poll, NAPI_POLL_WEIGHT);
|
|
}
|
|
|
|
/* Enable NAPI handler for init callbacks */
|
|
napi_enable(&net_device->chan_table[0].napi);
|
|
|
|
/* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
|
|
* populated.
|
|
*/
|
|
rcu_assign_pointer(net_device_ctx->nvdev, net_device);
|
|
|
|
/* Connect with the NetVsp */
|
|
ret = netvsc_connect_vsp(device);
|
|
if (ret != 0) {
|
|
netdev_err(ndev,
|
|
"unable to connect to NetVSP - %d\n", ret);
|
|
goto close;
|
|
}
|
|
|
|
return ret;
|
|
|
|
close:
|
|
napi_disable(&net_device->chan_table[0].napi);
|
|
|
|
/* Now, we can close the channel safely */
|
|
vmbus_close(device->channel);
|
|
|
|
cleanup:
|
|
free_netvsc_device(&net_device->rcu);
|
|
|
|
return ret;
|
|
}
|